Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf0a05277e4f518…

MALICIOUS

PDF

90.9 KB Created: 2021-09-12 17:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 171ed60b852f533e0e1048e572aaeeb4 SHA-1: fd56cc605da4c8356f2faa6b31b495da96bcb5cd SHA-256: fdf0a05277e4f5189abeadf926f2d354e52345a8d9ea7f988ddafe66cdd09922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable hosting, likely intended to lure users to malicious content or phishing pages. The presence of these links strongly suggests an attempt to deliver malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=aplikasi+yang+canggih+untuk+android PDF link annotation
    • http://studio-rivetti.it/userfiles/files/dozenovesazu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d985538b7b---furegekewiluta.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc35c8bde---gajivikasoderip.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/94614573798.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ecgkgn8gd989cjn0p0nlc4enr9/28123705199.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/21894644359.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383f412c03a---20417887712.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/verakewajikodubujixiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e503474fa83ca1f6b587c87901fde32/tavatijitunutono.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qj6mf88iru5vdgo056mntq536u/mopadawobajuwawul.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/73052215355.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeb688a91122387927c0a08192132a8b/80922824552.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630805191.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/xepuzudimoto.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/18915180969.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wijonotojanatonod.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/90630414616.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/nosojoganofafiloborod.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/72016357706.pdfIn PDF document text
    • https://adium.ru/userfiles/file/67114370035.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210911_1310B97AF5C0F810.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tujekawazadopozu.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mixomedetutasexufamanon.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/87729491958.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/jevudime.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/76739032058.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16644 bytes
SHA-256: 7aeead0fbf332d744f2c36f1f2ba2b9aec14be2615cb5c29e68f467b6c721fcd
font_02_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 10948 bytes
SHA-256: 745f179cb1c59c0104de90b6e4b53dc9fae43e8fdac744be5c63e7ab2291c569

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